<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    @import "./style.css";
    .hd {
      color: red;
    }

  </style>
</head>
<body>
  <div id="app">
    <p class="hd">我是 p</p>
  </div>
</body>
</html>